Patent GB-190622912-A (GB)
Title: Improvements in or relating to Trimming and Finishing Curved Stereotype Plates.
Inventor: HOPKINS CHARLES EDWARD
Filed: 1906-10-16
Granted: 1907-10-16
Abstract: 22,912. Hopkins, C. E. Oct. 16. Stereotype.-In apparatus for finishing stereotypes, applicable specially for use with casting- apparatus such as is described in Specification No. 15,314, A.D. 1905, the interior of the stereotype plate is shaved or bored before the head is cut off, so that time is allowed for the metal in the interior of the head to cool without any delay in the finishing of the plate. As the mould 2 is being closed for casting a plate, the previously cast plate 3 is pushed by fingers 61, 70 on the matrix clamps into a receiver A, being supported on the rests 18. As the plate is being pushed into the receiver, the clamps 110 on the receiver are forced back, against the action of springs 114, by projections 113 engaging with the head. The clamps 110 finally spring over the edge of the stereotype and hold it firmly in the receiver A. Meanwhile, the movement of the clamps 110 releases a spring- pressed clutch 118, through a catch 115 releasing the lever 116 and rod 117, thereby setting in motion the shaft 201 with the cam 202. This cam starts from the position shown in Fig. 2, and through a lever 204 and link 205 draws back the sliding block 122 to which the receiver A is pivoted. About midway between the casting-core 5 and the boring-cylinder C, the receiver A is given half a turn by means of a short rack 225 engaging a segmental block 224 fixed to the receiver, and the plate is thus made to face the boring-cylinder. When the plate is in position for boring, a cam 302 on the boring-cylinder shaft, driven by spur gearing at twice the speed of the' shaft 201, actuates through the levers 305, 304 to lock the clamps 300 into engagement with the recesses 301 in the receiver A, thereby holding it rigidly while the boriog-knife 312 shaves the interior of the plate. A recess 311 is provided in front of the knife 312 to collect the shavings. Immediately after this operation, the receiver A is released from the clamps 300, and at the same time a cam-piece 103 attached to the boring-cylinder C acts on a roller 102 on a lever 100 connected to the clamps 110 and releases the plate, which is instantly gripped to the cylinder C. by clamps 313, actuated by a stationary cam engaging with a roller 315 on a yoke piece 314, and caused to grip the plate by the head. The plate is thus transferred to the cylinder C and caused to move past the milling-cutters 319, rotated at a high speed by a. belt 402 from the pulley 400 on the main shaft 401, the bottom of the plate being bevelled, and the head cut off. A stop-piece 331, Fig. 1, on the cylinder C opposite the knife pushes the plate round, and when the head is nearly cut off bevelled rollers 340 on spring-pressed arms support the plate by the top and bottom edges. The plate is then delivered on the table 327 by fingers 328, the ends of which pass into recesses in the cylinder C, and also through gaps in the knife 312 and stoppiece 331. The head is released immediately after severance from the plate, and a spring-pressed, cam-controlled ejector 317, situated in the upper part of the cylinder C, pushes it over the shoot 350. On the return of the receiver A to its original position, the catch 115 uncouples the clutch 118 and thus stops the mechanism in position for the next cycle. On withdrawing the mould 2, a catch 7 engages with a lever 8 and withdraws a latch 14, which allows the bar 9 to slide forward under the action of a spring 16, thus coupling up a clutch by which the core 5 is rotated to bring the next stereotype into position for being pushed into the receiver A, as before exp'ained. After half a revolution, the latch 14 is engaged by the stop 15 and the clutch is uncoupled. The machine is then in position to start the cycle over again.